package com.alan.tomcat.page2;

import javax.servlet.ServletOutputStream;
import javax.servlet.ServletResponse;
import java.io.*;
import java.util.Locale;

/**
 * Created by Alan on 2018/11/15.
 */
public class Response implements ServletResponse {

    private static final int BUFFER_SIZE = 1024;
    Request request;
    OutputStream output;
    PrintWriter writer;

    public Response(OutputStream output) {
        this.output = output;
    }

    public void setRequest(Request request) {
        this.request = request;
    }

    //this method is used to server static pages
    public void sendStaticResources() throws IOException{
        byte[] bytes = new byte[BUFFER_SIZE];
        FileInputStream fis = null;
        try {
            //request.getUri has bean replaced by request.getRequestURI
            File file = new File(Constants.WEB_ROOT, request.getUri());
            fis = new FileInputStream(file);
            /*
                Http Response = Status - Line
                (( general - header) | response - header | entity - header)  CRLF)
                CRLF
                [ message - body ]
                Status - Line = Http-Version SP Status-Code SP Reason-Phrase CRLF
             */
            int ch = fis.read(bytes, 0, BUFFER_SIZE);
            while (ch != -1){
                output.write(bytes, 0, ch);
                ch = fis.read(bytes, 0, BUFFER_SIZE);
            }
        } catch (FileNotFoundException e){
            String errorMessage = "HTTP/1.1 404 File Not Found\r\n" +
                    "Content-Type: text/html\r\n" +
                    "Content-Length: 23\r\n" +
                    "\r\n" +
                    "<h1>File Not Found</h1>";
            output.write(errorMessage.getBytes());
        } finally {
            if(fis != null){
                fis.close();
            }
        }
    }

    @Override
    public String getCharacterEncoding() {
        return null;
    }

    @Override
    public String getContentType() {
        return null;
    }

    @Override
    public ServletOutputStream getOutputStream() throws IOException {
        return null;
    }

    @Override
    public PrintWriter getWriter() throws IOException {
        return null;
    }

    @Override
    public void setCharacterEncoding(String charset) {

    }

    @Override
    public void setContentLength(int len) {

    }

    @Override
    public void setContentType(String type) {

    }

    @Override
    public void setBufferSize(int size) {

    }

    @Override
    public int getBufferSize() {
        return 0;
    }

    @Override
    public void flushBuffer() throws IOException {

    }

    @Override
    public void resetBuffer() {

    }

    @Override
    public boolean isCommitted() {
        return false;
    }

    @Override
    public void reset() {

    }

    @Override
    public void setLocale(Locale loc) {

    }

    @Override
    public Locale getLocale() {
        return null;
    }
}
